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This picture taken on October 27, 2014 shows six-year-old Pan Yulin, who is from Hefei in Anhui province, reviewing his mathematics homework after his school was shut down recently by authorities in Shanghai's Baoshan district. China has complex residency laws and where most migrant workers remain registered in their native towns or villages, they do not qualify for the all-important hukou, or household registration permit in the city where they live. Without this document their children do not qualify for places in public schools, making the illegal fee-paying migrant schools their only option. CHINA OUT AFP PHOTO / JOHANNES EISELEJOHANNES EISELE/AFP/Getty Images